... and spectral composition vary on a diel basis. These features raise interesting questions about polar biological timekeeping from the perspectives of function and causal mechanism. Functionally, to what extent are evolutionary drivers for circadian timekeeping maintained in polar environments, and how does...

... at 74–81°N latitude. They spend winter in constant darkness (DD) and summer in constant light (LL); extreme photoperiodic conditions under which they do not display overt circadian rhythms. Here, we explored how Arctic adaptation in circadian biology affects photoperiodic time measurement in captive...

... of the circadian clock driving these two rhythms. For instance, the period gene plays an important regulatory role in both rhythms. In an earlier study, we have shown that selection on timing of adult emergence behaviour in populations of Drosophila melanogaster leads to the co-evolution of temperature sensitivity...

... circadian behavioral and physiological rhythms . Given that these anemones inhabit shallow estuarine environments subject to tidal inputs, it was unclear whether circadian rhythmicity would persist following entrainment in natural conditions, or whether circatidal periodicity would predominate. Nematostella...

...Moshe Nagari; Yafit Brenner; Guy Bloch ABSTRACT ‘Nurse’ honeybees tend brood around the clock with attenuated or no circadian rhythms, but the brood signals inducing this behavior remain elusive. We first tested the hypothesis that worker circadian rhythms are regulated by brood pheromones. We...

...Geoffrey T. Broadhead; Trisha Basu; Martin von Arx; Robert A. Raguso ABSTRACT Circadian patterns of activity are considered ubiquitous and adaptive, and are often invoked as a mechanism for temporal niche partitioning. Yet, comparisons of rhythmic behavior in related animal species are uncommon...

... for correspondence ( [email protected] ) Competing interests The authors declare no competing or financial interests. References Akiyama , T. ( 2014 ). Circatidal and Circadian Rhythms in Crustacean Swimming Behavior. Annual, Lunar, and Tidal Clocks . Japan : Springer , pp. 65 - 80...

...Vincent van der Vinne; Jenke A. Gorter; Sjaak J. Riede; Roelof A. Hut ABSTRACT Endogenous daily (circadian) rhythms allow organisms to anticipate daily changes in the environment. Most mammals are specialized to be active during the night (nocturnal) or day (diurnal). However, typically nocturnal...

... in the laboratory, reduction of pre-adult development time and shortening of the clock period occurs, suggesting a role for circadian clocks in the regulation of life history traits. Circadian clocks in D. melanogaster have also been implicated in the control of metabolic pathways, ageing processes, oxidative...

...Priya M. Prabhakaran; Vasu Sheeba SUMMARY We showed recently that Drosophila ananassae , a closely related and sympatric species of the commonly studied fruitfly D. melanogaster , shows distinctly deviant patterns in circadian activity/rest rhythm from the latter under a variety of laboratory...

... for olfaction . Trends Neurosci.   16 , 5 - 9 . Bullmann   T. , Stevenson   P. A. ( 2008 ). Nitric oxide as an efferent modulator of circadian pacemaker neurones in the eye of the marine mollusc Bulla gouldiana . Open Zool. J.   1 , 18 - 28 . Collmann   C. , Carlsson   M...

...Narendra Mukherjee; Nisha N. Kannan; Pankaj Yadav; Vijay Kumar Sharma SUMMARY Adult emergence (eclosion) of fruit flies Drosophila melanogaster under constant laboratory conditions follows a circadian pattern with bouts of eclosion recurring at approximately 24 h intervals. Under periodic...

...Shahnaz Rahman Lone; Vijay Kumar Sharma SUMMARY Circadian clocks regulate the physiology and behaviour of organisms across a wide range of taxa. To keep track of local time, these clocks use a variety of time cues such as light–dark, temperature, food availability and social interaction cycles...

.... * Author for correspondence ( [email protected] ) 7 12 2010 © 2011. 2011 circadian appetitive behavior honey bee memory microarray Honey bees ( Apis mellifera ) have the remarkable ability to form and use spatiotemporal memories in order to direct their foraging behavior...

...Robert Yammouni; Anna Bozzano; Ron H. Douglas SUMMARY Like many physiological systems synchronised to the light:dark cycle, retinomotor movements in ‘lower’ vertebrates are controlled by both the ambient illumination and input from endogenous circadian oscillators. In the present study, we examine...

...Shailesh Kumar; Dhanya Kumar; Dhanashree A. Paranjpe; Akarsh C. R.; Vijay Kumar Sharma SUMMARY To investigate whether circadian clocks in fruit flies Drosophila melanogaster evolve as a consequence of selection on the timing of adult emergence, we raised four replicate populations each of early...